arch-arm: Fixed spacing issue in ARM_MOESI_hammer

Change-Id: I5e38d1fb0b3c61ae40d26db21b8d20cc3199b391
Jira: https://gem5.atlassian.net/browse/GEM5-594
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/29393
Maintainer: Bobby R. Bruce <bbruce@ucdavis.edu>
Reviewed-by: Jason Lowe-Power <power.jg@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
diff --git a/build_opts/ARM_MOESI_hammer b/build_opts/ARM_MOESI_hammer
index 2eddc5b..2ba8ce8 100644
--- a/build_opts/ARM_MOESI_hammer
+++ b/build_opts/ARM_MOESI_hammer
@@ -2,5 +2,5 @@
 # All rights reserved.
 
 TARGET_ISA = 'arm'
-CPU_MODELS = 'TimingSimpleCPU, O3CPU'
+CPU_MODELS = 'TimingSimpleCPU,O3CPU'
 PROTOCOL = 'MOESI_hammer'